lecture 19 - Arthropoda (Cont.)

lecture 19 - Arthropoda (Cont.) - 1. Crustacea (fig....

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1. Crustacea (fig. 30-23), such as crabs and lobsters, shrimp, daphnia (two antennae, two body parts) a. Cephalothorax, abdomen b. two pairs antennae – sensory organs (for touch) - mandibles (has jaws, lower jaw) - 5 pairs walking legs (total of 10) biramous – branched c. Exoskeleton – in addition to chitin they also have calcium carbonate (which makes it very tough); they are considered consumers but they are very low on the food chain (they eat algae and other small organisms) 2. Hexapoda – (includes insects, there is still a lot of work to do with insects because they aren’t considered monophyletic) a. Crustaceans – insects probably evolved from the crustaceans b. Uniramous appendages (fig. 30-34) c. Have a single pair of antennae d. Terrestrial - Tracheated – have tracheas instead of gills - Hexapod – you can count the number of legs - Head, thorax, abdomen – not a Cephalothorax - 1 or 2 pairs of wings (the only one of the arthropods that would have wings); this is important because it is one of the reasons insects have
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This note was uploaded on 05/30/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.

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lecture 19 - Arthropoda (Cont.) - 1. Crustacea (fig....

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